Alleviation of Cosmic Age Problem In Interacting Dark Energy Model

TL;DR

This paper explores how interacting dark energy models can resolve the cosmic age problem posed by old high-redshift objects, showing that dark matter-dark energy interaction extends the universe's age predictions.

Contribution

It demonstrates that dark matter and dark energy interaction is essential to reconcile cosmic age estimates with observations, improving upon standard $ ext{Lambda}$CDM models.

Findings

Interacting dark energy models predict older universe ages than $ ext{Lambda}$CDM.

Dark matter-dark energy interaction significantly alleviates the cosmic age problem.

Models with interaction match observed ages of old high-redshift objects.

Abstract

We investigate the cosmic age problem associated with the old high-$z$ quasar APM 08279 + 5255 and the oldest globular cluster M 107, both being difficult to accommodate in $\Lambda$CDM model. By evaluating the age of the Universe in a model that has an extremely phantom like form of dark energy (DE), we show that simply introducing the dark energy alone does not remove the problem, and the interaction between dark matter (DM) and DE need to be taken into account. Next, as examples, we consider two interacting DE models. It is found that both these two interacting DE Models can predict a cosmic age much greater than that of $\Lambda$CDM model at any redshift, and thus substantially alleviate the cosmic age problem. Therefore, the interaction between DM and DE is the crucial factor required to make the predicted cosmic ages consistent with observations.